Clinical Validity of Quantified Visually Enhanced Vestibulo-ocular Reflex Test to Detect Horizontal Semicircular Canal Hypofunction.

OBJECTIVE: To investigate the clinical validity of the mathematical measured VVOR test results to detect horizontal semicircular canal hypofunction. STUDY DESIGN: Prospective, nonrandomized, observational study. SETTING: Tertiary referral center, hospital. PATIENTS: Consecutive patients on first time visit to otoneurology unit. INTERVENTION(S): Diagnostic. MAIN OUTCOME MEASURE(S): Values of statistical indicators of clinical validity for VVOR test to detect horizontal canal hypofunction were used considering vHIT horizontal aVOR gain values as gold standard. RESULTS: Area under curve of ROC curve for quantified VVOR testing was 0.92. Head movement frequency on VVOR test and contralateral VVOR gain were identified as significant influence factors of (unilateral) VVOR gain (p < 0.0001) on statistical linear model. CONCLUSIONS: According to the obtained results, the quantified VVOR test has excellent clinical validity for detecting angular horizontal VOR hypofunction.